![]() Now you are ready to run your wires according to the wiring diagram. If you purchased your relay from a reputable source, it will have numbered terminals, which aid greatly in connecting everything correctly.Ī three way connection is made to the power source for both lights. The low current through the switch triggers the relay to make a higher current connection to the heavy load of the fog lights. Basically, the relay protects the switch from getting hot and creating unwanted resistance. Relays are an important component in wiring fog or driving lights with a 30-60A draw. You’ll find examples of switches, lights, fuses-it’s helpful to understand and keep a universal language of the components in your drawings. If you need assistance drawing a diagram, refer to your car’s factory workshop manual (reprints are available from Moss). Pictured is my wiring diagram for installing two fog lights with fuses, a switch, and a relay. This wiring diagram will stay with the car so make it neat and easily readable. Draw a diagram on plain white paper with wire gauge noted and colors identified. Sheet metal screws (for connecting ground wires to body)īefore cutting any wire, a good diagram is in order.Switch (with three male spade connectors on back).Relay (with four male spade connectors on back).The reason is simple, the color identifies the purpose of each wire and if I ever have a problem I can track it down using my wiring diagram. I will need several colors of 14-gauge wire: black, green, white, and red. In my case, 80% of 11.8A is 9.44A so a 10-amp inline fuse is perfect. This will ensure that you blow the fuse before you burn the wire. The rule of thumb is this: the fuse ought to be rated near 80% of the amperage of the wire. To protect my 14-gauge wiring I will be installing 10-amp inline fuses. Amps are a measure of current flow volts are a measure of the force behind the flow of current. I will be using 14-gauge wire, which handles up to 11.8A. Since I will be wiring the lights to the relay with one lead, 70W/12V= 5.8A. The formula for amperage is watts divided by volts equals amps, or W/V=A. My lamps are vintage and each unit reads 35 watts. The first order of business is to determine the amperage of your driving/fog lights. Let’s begin with your lights already mounted to the car, the wires dangling beneath or behind and waiting to receive power from Mr. I picked up two vintage fog lights at a yard sale and these will be installed on my Volvo. My 1966 Volvo 122S may not be British, but it does use many components common to the cars of England. After a few smoke-filled incidents I am much more careful. I remember the days when I rummaged about in my “box of wires” and grabbed any gauge wire of sufficient or insufficient length, splicing together a “rat’s nest” of wire connections and crimped ends to connect any number of desired accessories. See the Daytime Running Lights how-to.The fog lights are mounted and ready for power. Power to lights, green goes to switch in the cockpit The factory fog light switch - $70 Want to turn your fog lights into daytime running lights? Bonus-youĭon't have to run wires to a cockpit switch. ![]() Finally you have to ground the fog lights. Terminal, ground the ground terminal (see photo), and connect both fog lights to the power The fog light switch wire connects to the control When the relay gets power to the control terminal The relay has threeĬonnections: control, ground, and power. The fog lights pull too much amperage to use a straight on/off switch. The control wire that tells the relay to power the lights. Powered wire (and in-line fuse) from the fuse box to the fog light switch and run a wireįrom the other switch terminal through the firewall to the fog light relay. Little metal adapters that go on the fuses to allow you to tap into the fuse box. You have to tap into a switched power source at the fuse box. Mounting in the nose Wiring the lights I bought the stock fog light switch from the dealer for $70 so it would look factory. I mounted the lights by drilling two small holes and using small self Running Light controller and skip the cockpit (just follow the cable from the lever under the dash to the firewall. I was able to get mine through at the hood opening cable The toughest part of installing fog lights is getting the How To Install Fog Lights By Rob Robinette ![]()
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